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Why is the wet boil temperature different with different brake fluids? Water boils at 212 degrees at sea level pressure. How does the brake fluid change that?
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Each manufacturers fluids have different dry boiling points... and most/all are hygroscopic... (absorbs water)..
When the brake fluid absorbs water.... the dry boiling point changes.... and the amount of water the fluid absorbs affects the wet boiling point.. Old fluids may have a lot of water entrained... new fluid much less...
The problem is when the water portion of the brake fluid boils ... it turns to a gas.... and is compressible.. When water is liquid.. it is considered "incompressible"
Which equals a spongy brake pedal... or worse... a brake pedal with no response..